CN102387060A - Building method and device for label switched path tunnels - Google Patents
Building method and device for label switched path tunnels Download PDFInfo
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Abstract
The invention provides a building method and a device for label switched path (LSP) tunnels. The method includes that a P router judges whether a set LSP policy allows the P router to serve as an agency outlet Proxyegress to announce an LSP mark to a PE router connected with the P router after the P router learns route reaching an interface, if not allowed, the P router does not announce the LSP mark to the PE router connected with the P router so as to prevent the PE router from being built in an LSP tunnel of the interface, and if allowed, the P router announces the LSP mark to the PE router connected with the P router so as to enable the PE router to be built in the LSP tunnel of the interface. By adopting the building method and the device, label distribution protocol (LDP) and LSP tunnel building can be controlled, and a public network LDP and LSP tunnel can provide a reliable end-to-end tunnel in the virtual private network (VPN) application.
Description
Technical field
The present invention relates to route technology, particularly label switched path (LSP) tunnel establishing method and device.
Background technology
MPLS VPN (MPLS VPN) is the IP backbone cross winding dehorn standard of new generation that is proposed by IETF, is a kind of IP Over atm technology of integrated form.It has merged the advantage of flexibility of IP route technology and ATM switching technology terseness, in connectionless IP network, having introduced the connection-oriented attribute of MPLS, the label that the is similar to virtual circuit reciprocal exchange of business is provided.
MPLS VPN has three types router: ce router, pe router and P router.Wherein, ce router is a client router, and for the user is provided to the connection of pe router, pe router is a provider edge router, and the P router is the carrier network backbone router.Referring to Fig. 1, Fig. 1 is existing common networking sketch map.In Fig. 1, CE1, CE2 are ce router, and PE1-M, PE2-M are pe router, and P-M is the P router.
In Fig. 1, P-M can be used for setting up BGP equity syntople with PE1-M and PE2-M simultaneously as Border Gateway Protocol (BGP) Router Reflector.In addition, in order to strengthen network reliability, also disposed one group of backup router, wherein, PE1-S and PE2-S are pe router, and P-S is the P router, also as bgp router reflector.
If CE1, CE2 belong to same VPN, under normal circumstances, the VPN flow of CE2 to CE1 is walked main path, i.e. PE2-M->P-M->PE1-M.And when PE1-M breaks down; PE1-M is connected (route that is used to issue ce router) and label distribution protocol conversation (LDP session with BGP between P-M; Be used to create the label switching path LSP tunnel) interrupt; In order to guarantee the stability of VPN flow, the VPN flow is switched to path, i.e. PE2-M-fully>PE2-S <-P-S <-PE1-S.
And when PE1-M recovers, will rebuild BGP with P-M and be connected and the LDP session.If the ratio that this LDP session is set up is later; Be later than IGP route (being used to issue the route of pe router) study and BGP establishment of connection; Promptly before the LDP session between P-M and PE1-M is not set up; PE1-M is connected with the IGP route learning with BGP between the P-M and accomplishes, so, and when P-M learns the route of loopback (loopback) interface 10.1.1.1/32 of PE1-M; P-M will be as act as export agent (proxy egress) to PE2-M announcement label, and PE2-M will be established to LDP inlet (ingress) LSP of 10.1.1.1/32.Afterwards; PE2-M utilizes the BGP that sets up between PE1-M and the P-M to be connected the VPN route of learning CE1 from PE1-M; Because the LDP ingress LSP of PE1-M sets up; Therefore, PE2-M thinks that this VPN route of learning can use, will be with to the flow switchback main path of CE1 (PE2-M->P-M->PE1-M).And in fact,, therefore, can not transmit the VPN flow between P-M and the PE1-M because the LDP session between P-M and the PE1-M is not also set up, this causes the VPN flow behind P-M, promptly to interrupt.
Summary of the invention
The invention provides label switched path (LSP) tunnel establishing method and device so that control LDP lsp tunnel sets up, make VPN use in public network LDP lsp tunnel reliable end-to-end tunnel can be provided.
Technical scheme provided by the invention comprises:
A kind of label switched path tunnel method for building up comprises:
After the P router is learnt to arrive the route of an interface; Judge whether the LSP strategy that is provided with allows self to announce the LSP label as Proxy egress to the pe router that connects, if not, then not to the pe router announcement LSP label that connects; To stop this pe router to be established to the lsp tunnel of said interface; If, then to the pe router announcement LSP label that connects, so that this pe router is established to the lsp tunnel of said interface.
A kind of be applied to label switched path (the P router that the tunnel is set up comprises:
Judging unit is used to judge whether the LSP strategy of setting allows said P router to announce the LSP label as the Proxy egress that acts as export agent to the pe router that connects;
Processing unit is used in the judged result of said judging unit when being, to the pe router announcement LSP label that connects, so that this pe router is established to the lsp tunnel of said interface; For not the time, or not be not established to the lsp tunnel of said interface in the judged result of said judging unit to stop this pe router to the pe router announcement LSP label that connects.
Can find out by above technical scheme; Among the present invention,, can guarantee that the P router is after learning interface route on the P router through the LSP strategy is set; Be not to announce the LSP label as Proxy egress to the pe router that connects blindly; So that pe router is established to the lsp tunnel of said interface, but judge earlier whether this LSP strategy allows self to announce the LSP label as Proxy egress to the pe router that connects, and this is than prior art; Can control the LDP lsp tunnel and set up, make VPN use in public network LDPLSP tunnel reliable end-to-end tunnel can be provided;
Further, in supporting the few equipment network application scenarios of lsp tunnel quantity, the present invention can prevent a large amount of useless lsp tunnels impacts and cause real useful lsp tunnel to set up through the foundation of control lsp tunnel.
Description of drawings
Fig. 1 is existing common networking sketch map;
The basic flow sheet that Fig. 2 provides for the embodiment of the invention;
The structure drawing of device that Fig. 3 provides for the embodiment of the invention.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer, describe the present invention below in conjunction with accompanying drawing and specific embodiment.
Technical scheme provided by the invention comprises flow process shown in Figure 2:
Referring to Fig. 2, the basic flow sheet that Fig. 2 provides for the embodiment of the invention.As shown in Figure 2, this flow process can comprise:
After step 201, P router are learnt to arrive the route of an interface, judge whether the LSP strategy that is provided with allows self to announce the LSP label as Proxy egress to the pe router that connects, if, execution in step 202; Otherwise, execution in step 203;
Here, this interface can be and is connected with said P router and is the loopback interface on the pe router that recovers after the fault, certainly, also can be the interface on other routers, does not specifically limit here.
If the interface in the step 201 is for being connected with said P router and being the loopback interface on the pe router that recovers after the fault, then step 202 and pe router in the step 203 are essentially that be connected and the pe router that after fault, recover of P router other and are in the pe router of normal condition.
So far, accomplish flow process description shown in Figure 2.
In above-mentioned flow process; The LSP strategy of step 201 specifically comprises following content: to the interface route of learning from the pe router that recovers after the fault; If the LDP session between pe router that recovers after this fault and the said P router is not set up, then do not allow said P router to announce the LSP label to other pe routers that connect as Proxy egress; Otherwise, allow said P router to announce the LSP label to other pe routers that connect as Proxy egress; And, then allow this P router to announce the LSP label to other pe routers that connect as Proxy egress to the interface route of learning from this machine.In order to realize this LSP strategy, can be provided with the P router in the following manner:
1, the LSP strategy controller is set on the P router; This LSP strategy controller can be according to above content setting; Can be during concrete the realization: allowing the P router as Proxy egress during to other pe routers announcements LSP label of connecting; Open this LSP strategy controller, otherwise, close this LSP strategy controller.Preferably; Present embodiment can be given tacit consent to the LSP strategy controller and be in opening; And when allowing the P router as Proxy egress during to other pe routers announcements LSP label of connecting; This opening is switched to closed condition, such as realizing through order " undo mpls ldp proxy " control.
2, LDP LSP strategy controller is set on the P router; This LDP LSP strategy controller is except realizing whether control P router allows as Proxy egress to other pe router announcements LSP label that connects; Also can control (preferably the LSP type that forwarding equivalence class (FEC) allows to set up; LDP LSP strategy controller can be set not to be controlled under default situations), such as, control data transmission (transit); Control inlet (ingress) etc., specifically can be through with the realization of issuing orders:
Lsp-policy ip-prefix prefix-name for{egress|transit|ingress etc. }.
Based on above description, if the interface in the step 201 is for being connected with said P router and being the loopback interface on the pe router that recovers after the fault, then the judgement in the step 201 is specially:
Judge whether the pe router that recovers after the said fault and the LDP session between the said P router set up, if not, then do not allow said P router as Proxy egress to other pe routers announcements LSP label that connects; Otherwise, allow said P router to announce the LSP label to other pe routers that connect as Proxy egress.
Need to prove; If the LSP strategy is to realize through LDP LSP strategy controller is set on the P router; Because this LDP LSP strategy controller also can be controlled the LSP type that FEC allow to set up, therefore, at the P router during at transmission tag to other pe routers of connecting; Also can carry out following operation: to each pe router in said other pe routers; Said P router judges whether said Data Transmission Controlling strategy allows to send label to this pe router, when being, sends said label to this pe router; Otherwise, ignore this label.
When other pe routers receive the LSP label; After setting up the lsp tunnel that arrives the loopback interface; Can further comprise: if the flow that the pe router that other pe routers recover after the forward direction fault sends adopts the backup path transmission; Then when the lsp tunnel of this foundation belongs to primary path, other pe routers switch to this flow on the primary path of the lsp tunnel that comprises this foundation and transmit.For scheme that the embodiment of the invention is provided is clearer, lifts a specific embodiment below and describe:
Be example with networking shown in Figure 1 still, in Fig. 1, under the normal condition, the VPN flow of CE2 to CE1 is walked main path, i.e. PE2-M->P-M->PE1-M.And when PE1-M broke down, PE1-M was connected and the LDP conversation with BGP between P-M, in order to guarantee the stability of VPN flow, the VPN flow switched to be equipped with path, i.e. PE2-M-PE2-S <-P-S <-PE1-S.
And when PE1-M recovers, will rebuild BGP with P-M and be connected and the LDP session.If the ratio that this LDP session is set up is later, be later than IGP route (being used to issue the route of pe router) study and BGP establishment of connection, promptly before the LDP session between P-M and PE1-M is not set up; PE1-M is connected with the IGP route learning with BGP between the P-M and accomplishes; So, when P-M learns the route of loopback interface 10.1.1.1/32 of PE1-M, because this route be the PE1-M study after the fault recovery; And the LDP session between P-M and PE1-M is not set up at this moment; Therefore, increased above-mentioned policy control based on this P-M, this P-M just can not announce label to PE2-M as proxy egress; So, PE2-M just can not be established to the LDP ingress LSP of 10.1.1.1/32.Even PE2-M utilizes the BGP that sets up between PE1-M and the P-M to be connected the VPN route of learning CE1 from PE1-M afterwards; Because this PE2-M does not set up to the LDP ingress LSP of PE1-M; Therefore; PE2-M can think that this VPN route of learning is unavailable, still makes the flow of CE 1 walk path fully.
After the LDP of PE1-M and P-M session is set up; PE1-M is as the label of egress to P-M announcement 10.1.1.1/32; If P-M continues then after PE2-M receives this label, will be established to the LSP of the 10.1.1.1/32 of PE1-M to PE2-M announcement label according to above-mentioned policy control.At this moment, PE2-M thinks and can use from the VPN route to CE1 of PE1-M study, will the flow to CE1 be switched to main path (PE2-M->P-M->PE1-M).And in fact this VPN route of learning is available really, this flow is switched to main path can not cause the VPN flow interrupt.Can find out, adopt the present invention, can keep the continuity of VPN flow, and can be implemented in the VPN application, guarantee that public network LDP LSP provides the end-to-end reliable tunnel of PE-PE.
Preferably, in another embodiment of the present invention, the tactful section of above-mentioned LSP comprises the route-type that allows to transmit the LSP label; So, the judgement in the step 201 comprises: whether the route-type of judging study is present in the said LSP strategy, if not, does not then allow said P router to announce the LSP label as Proxy egress to the pe router that connects; If allow said P router to announce the LSP label to the pe router that connects as Proxy egress.In this embodiment, the interface that does not limit study repeats no more for being connected with the P router and for the loopback interface on the pe router that recovers after the fault, realizing that specifically principle and top description are similar here.
More than method that the embodiment of the invention is provided be described, the device that provides in the face of the embodiment of the invention is down described.
Device in the present embodiment is specially and is applied to the P router that lsp tunnel is set up, and as shown in Figure 3, this device can comprise:
Preferably, said interface is to be connected with said P router and is the loopback loopback interface on the pe router that recovers after the fault;
Based on this; Judging unit 301 judges whether the pe router that recovers after the said fault and tag distribution protocol (LDP) session between the said P router set up; Do not announce LSP label as Proxy egress to other pe routers that connect if, then do not allow said P router; If allow said P router to announce the LSP label to other pe routers that connect as Proxy egress.Processing unit 302 when being, is announced LSP label to other pe routers that are in normal condition that the pe router that connects and after fault, recover is at judging unit 301.
In the present embodiment, the LSP strategy of setting also comprises the Data Transmission Controlling strategy; Based on this; Processing unit 302 comprises to other pe router announcements LSP label: to each pe router in other pe routers; Said P router judges whether said Data Transmission Controlling strategy allows to send label to this pe router, when being, sends said label to this pe router; Otherwise, ignore this label.
As another embodiment of the present invention, said LSP strategy also comprises the route-type that allows to transmit the LSP label; Said judging unit is used for judging whether the route-type of study is present in said LSP strategy, if not, does not then allow said P router to announce the LSP label as Proxy egress to the pe router that connects; If allow said P router to announce the LSP label to the pe router that connects as Proxy egress.
Can find out by above technical scheme; Among the present invention,, can guarantee that the P router is after learning interface route on the P router through the LSP strategy is set; Be not to announce the LSP label as Proxy egress to the pe router that connects blindly; So that pe router is established to the lsp tunnel of said interface, but judge earlier whether this LSP strategy allows self to announce the LSP label as Proxy egress to the pe router that connects, and this is than prior art; Can control the LDP lsp tunnel and set up, make VPN use in public network LDP lsp tunnel reliable end-to-end tunnel can be provided.
Further, in supporting the few equipment network application scenarios of lsp tunnel quantity, the present invention can prevent a large amount of useless lsp tunnels impacts and cause real useful lsp tunnel to set up through the foundation of control lsp tunnel.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope that the present invention protects.
Claims (10)
1. a label switched path (LSP) tunnel establishing method is characterized in that this method comprises:
After the P router is learnt to arrive the route of an interface; Judge whether the LSP strategy that is provided with allows self to announce the LSP label as the Proxy egress that acts as export agent to the pe router that connects, if not, then not to the pe router announcement LSP label that connects; To stop this pe router to be established to the lsp tunnel of said interface; If, then to the pe router announcement LSP label that connects, so that this pe router is established to the lsp tunnel of said interface.
2. method according to claim 1 is characterized in that, said interface is to be connected with said P router and is the loopback loopback interface on the pe router that recovers after the fault;
Said P router comprises to the pe router announcement LSP label that connects:
Said P router is announced the LSP label as Proxy egress other pe routers that are in normal condition to the pe router that connects and after fault, recover.
3. method according to claim 2 is characterized in that, said judgement comprises:
Judge whether the pe router that recovers after the said fault and tag distribution protocol (LDP) session between the said P router set up, if not, then do not allow said P router as Proxy egress to other pe routers announcements LSP label that connects; If allow said P router to announce the LSP label to other pe routers that connect as Proxy egress.
4. according to the arbitrary described method of claim 2 to 3, it is characterized in that, after other pe routers foundation arrive the lsp tunnel of said loopback interface, further comprise:
If the flow that the pe router that said other pe routers recover after the said fault of forward direction sends adopts the backup path transmission; Then when the lsp tunnel of this foundation belongs to primary path, said other pe routers switch to said flow on the primary path of the lsp tunnel that comprises this foundation and transmit.
5. according to the arbitrary described method of claim 2 to 3, it is characterized in that the LSP strategy of said setting also comprises the Data Transmission Controlling strategy;
Said P router comprises to other pe router announcements LSP label:
To each pe router in other pe routers, said P router judges whether said Data Transmission Controlling strategy allows to send label to this pe router, when being, sends said label to this pe router; Otherwise, ignore this label.
6. method according to claim 1 is characterized in that, said LSP strategy comprises the route-type that allows to transmit the LSP label; Said judgement comprises:
Whether the route-type of judging study is present in the said LSP strategy, if not, does not then allow said P router to announce the LSP label as Proxy egress to the pe router that connects; If allow said P router to announce the LSP label to the pe router that connects as Proxy egress.
7. one kind is applied to the P router that label switched path (LSP) tunnel is set up, and it is characterized in that this P router comprises:
Judging unit is used to judge whether the LSP strategy of setting allows said P router to announce the LSP label as the Proxy egress that acts as export agent to the pe router that connects;
Processing unit is used in the judged result of said judging unit when being, to the pe router announcement LSP label that connects, so that this pe router is established to the lsp tunnel of said interface; For not the time, or not be not established to the lsp tunnel of said interface in the judged result of said judging unit to stop this pe router to the pe router announcement LSP label that connects.
8. device according to claim 7 is characterized in that, said interface is to be connected with said P router and is the loopback loopback interface on the pe router that recovers after the fault;
Whether tag distribution protocol (LDP) session between pe router that recovers after the said fault of said judgment unit judges and the said P router sets up; Do not announce LSP label as Proxy egress to other pe routers that connect if, then do not allow said P router; If allow said P router to announce the LSP label to other pe routers that connect as Proxy egress;
Said processing unit when being, is announced LSP label to other pe routers that are in normal condition that the pe router that connects and after fault, recover is at said judging unit.
9. device according to claim 8 is characterized in that, the LSP strategy of said setting also comprises the Data Transmission Controlling strategy;
Said processing unit comprises to other pe router announcements LSP label: to each pe router in other pe routers; Said P router judges whether said Data Transmission Controlling strategy allows to send label to this pe router; When being, send said label to this pe router; Otherwise, ignore this label.
10. device according to claim 7 is characterized in that, said LSP strategy comprises the route-type that allows to transmit the LSP label; Said judging unit is used for judging whether the route-type of study is present in said LSP strategy, if not, does not then allow said P router to announce the LSP label as Proxy egress to the pe router that connects; If allow said P router to announce the LSP label to the pe router that connects as Proxy egress.
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| CN102387060B (en) | 2015-02-11 |
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